We are maximizing impact of solar thermal technology
by breaking solar thermal’s cost and complexity barriers

To do this, we have built an ecosystem of own brands and partners.

As an Impact Engineering firm we are dedicated to develop whatever is necessary to have a significant impact on climate change and poverty, globally. To this end we have developed our Lytefire solar oven, roasters and Saunas, our GoSol education program to create entrepreneurs and strong partnerships to scale.

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Our Brands

Lytefire is our product to rapidly enable anyone to become a solar entrepreneur.

GoSol is our community and education hub to spread the Lytefire 5 Solar Ovens to high-impact settings.

The Lytefire Sauna demonstrates the power of the sun for carbon free well-being and tourism.

Latest Press


Friday 23 October 2020

"The sun can do everything - even bake bread"

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Solar Energy Engineering Blog

Thursday 1 October 2020

"Can Solar Thermal Energy be a Game-Changer? — Part 2"

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Solar Energy Engineering Blog

Thursday 1 October 2020

"Can Solar Thermal Energy be a Game-Changer?"

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Paris Normandie

Tuesday 22 September 2020

"Un four à pain solaire de 11 m² construit dans la région du Havre, et c’est une première !"

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Thursday 17 September 2020

"Solar Sauna - Lytefire Sauna; A sustainable, powerful and silent wellness experience at 2000 meters above sea level: The Lytefire Sauna heats up (...)

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Friday 4 September 2020

"so-talk Urs Riggenbach, Lytefire und GoSol.Solar"

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First Class

Tuesday 1 September 2020

"Saunaing with the sun"

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Tuesday 11 August 2020

"Sauberer Schwitzkasten"

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Tuesday 11 August 2020

"Sustainable wellness in the new solar sauna"

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Company News

Followup visit in the Philippines: 8 months later

Monday 27 April 2020, by Eva Wissenz

We recently revisited our partners USTP (The University of Science and Technology of the Southern Philippines) and CarbonCycle in Cagayan de Oro, (...)

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Crowdfunding for a Solar Bakery in Burkina Faso

Wednesday 1 April 2020, by Lorin Symington

We are very happy to have launched a small crowdfunding campaign to support two dynamic guys in Burkina Faso to create a solar bakery and (...)

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Powerful talk: it’s all connected.

Tuesday 31 March 2020, by Eva Wissenz

You need to take 7 minutes and watch this, it’s definitely worth it! Here’s our Chief Operating Officer Urs Riggenbach talking about solar, (...)

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We’re coming to your doorstep !

lundi 30 mars 2020, by Eva Wissenz

Last Christmas, as an act of faith in people’s empowerment and in our solution to play a significant role in climate change crisis resolution, we (...)

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Building in Burkina Faso with Remar

Thursday 27 February 2020, by Lorin Symington

We launched a new project with Remar International in Burkina Faso to empower women entrepreneurs. As always we fabricated the solar units (...)

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Lake still not frozen in Finland!

Monday 10 February 2020, by Eva Wissenz

Video Message from Eva, chairperson of GoSol / Solar Fire: My hope is not an illusion, it’s real and strong but today I’m sad, and angry. Everybody (...)

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Why Solar Fire

Access to clean energy is a real problem world wide


3 billion people

Need a clean source of heat every day to process food or run their business.
Today they burn charcoal, trash, LPG, biomass or rely on poor electric grids.

11 years

Remaining in order to reduce heavily carbon emissions from growth, according to the IPCC.

3 billion people

Empowered with affordable and powerful clean energy can have a very strong impact on climate change mitigation.

Sponsors, Partners and Clients


From our Channel

Lytefire Sauna - The Experience - Heuberge 2020

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Scaling the Direct Solar Economy

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Free the Sun!

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Cooking in the Snow

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